抛锚作业安全出链长度探讨

船舶在抛锚作业中常因受外界因素的影响而致使锚泊力不断变化，如果出链长度不够，将导致走锚。此文通过对影响船舶抛单锚出链长度的因素进行分析，来确定船舶抛单锚作业的安全出链长度。     

基于中间产品纳期计划的造船供应商评估体系研究

基于中间产品纳期计划对造船供应商评估过程进行分析,从影响中间产品纳期计划的因素中分析与造船供应商的关系,并与造船供应商类型、层次相结合,构建造船供应商评估指标体系。利用层次分析法(AHP)对造船供应商进行预选择;利用模糊层次分析法(F-AHP)对预选择选出的造船供应商进行决策阶段选择评估提供了解决方案。     

大数据环境下的船舶中间产品装配工时预测模型

基于大数据环境提出考虑误差修正的两阶段船舶中间产品装配工时预测模型。从船舶设计软件中提取中间产品装配工艺信息，建立反向传播神经网络(Back Propagation Neural Network, BPNN)模型，实现装配工时的初步预测。采集对装配工时预测可能造成影响的外界因素大数据，建立基于极端梯度提升(Extreme Gradient Boosting, XGBoost)算法的装配工时预测误差修正模型。两阶段预测结果相加得到装配工时预测值。实例验证该预测模型的有效性，可为船舶企业完善装配工时管理提供切实可行的解决思路。     

船舶中间产品标识定位系统设计与实现

利用二维码实现中间产品信息的索引,采用交互式多模型(Interacting Multiple Model, IMM)卡尔曼滤波法优化的飞行时间(Time of Flight, TOF)定位算法,实现中间产品的位置跟踪。根据船舶车间的标识定位需求,研发船舶中间产品标识定位系统,对船舶中间产品的加工工序、基本信息、位置信息等进行跟踪,为船厂备料套料、物流运输、加工监控等提供有力的数据支撑。     

应用神经网络实现中间产品加工工时定额的快速计算

准确地计算中间产品加工工时定额是制定合理生产计划的基础.以前的工时定额数据主要来源于已建造的同类型船舶的数据积累,这种工时估算过多地依赖于人的经验,而且也没有针对中间产品族的加工单独给出工时定额.为适应中间产品的专业化生产,需要提供不同中间产品族生产的工时定额,作为制定中间产品族生产单元作业计划的依据.本文通过对部件特征的描述,划分出了部件加工族,并以一部件族为例,通过分析该部件族的典型部件生产过程,得到了部件生产工时定额的影响因素,并且应用BP神经网络建立工时定额和影响因素之间的映射关系,从而可以通过神经网络方便、准确地计算出该部件族中每个部件生产的工时定额.     

船舶电力系统恒功率负载稳定性仿真研究

根据恒功率负载对船舶电力系统的稳定性的影响,探索影响系统稳定性的因素.通过分析恒功率负载的特性及实现方法并建立系统船舶电力系统带恒功率负载系统的Matlab/Simulink模型,研究了启动、突加、突减负载和短路等不同工况下恒功率负载对船舶电力系统稳定性的影响进行了验证.通过研究,确定了系统稳定性的因素,为未来船舶的电力系统的设计提供参考.     

基于区块链技术的船舶信息安全预测

研究基于区块链技术的船舶信息安全预测方法,提升船舶信息传输的安全性。利用模型链整合区块链技术与信息安全预测算法,实现船舶信息的安全传输。模型链选取Boosting算法作为信息安全预测算法,预测船舶信息传输节点的决策权。确定具有决策权的船舶信息传输节点后,区块链技术采用改进的共识机制,利用区块链加密服务提供商为船舶信息传输提供密码服务。区块链加密服务提供商选取SM2签名算法作为区块链加密服务的数字签名方案,保证船舶信息传输安全。实验结果表明,船舶通信系统节点数量为80个时,区块链技术的共识效率提升比高达22%,可以实现船舶信息的安全传输。     

渔港海船闸通过能力的计算方法

船闸通过能力是确定船闸规模的重要因素。渔港海船闸大都处于复杂潮位条件下,合理的计算船闸的通过能力变得极为重要。基于船舶通航安全所需水深和潮汐情况,建立某潮水位累积频率下的实际潮位计算模型,同时将通过能力计算分为平潮期和非平潮期。其中对非平潮期通过能力的计算方法进行修正,考虑船舶在闸室内的移泊时间,同时引入"单元船舶(队)"概念,简化船型的选取和组合,使得一个闸次过闸船舶数的确定更方便、准确。平潮期通过能力计算基于船舶通航水深和潮汐特征,采取一定的船闸营运组织模式,考虑船闸营运组织模式对船舶通航的影响,同时考虑船闸的服务水平的影响,使计算结果更为合理。     

考虑船舶航速的集装箱班轮燃油补给策略

针对集装箱班轮运输中船舶燃油补给问题,分析船舶航速变化对燃油消耗产生的非线性影响,推导出船舶航速与船舶往返时间及船舶油耗之间的关系式,以连续多航次船舶燃油补给总成本最低为目标,加油港与加油量为决策变量,建立周计划内考虑航速的集装箱班轮燃油补给混合整数非线性规划模型.根据模型特点,利用分段线性逼近函数对模型进行等价转换.以某航运公司的亚欧单航线为仿真实验,依次分析港口时间窗、船舶类型、燃油价格及船舶油舱容量等因素对船舶燃油补给策略的影响.结果表明:该模型可以同时决策船舶加油港的选择、加油量的大小及航速的调整,比传统模式更能节省油耗和成本.     

基于MBD技术的隔舱分段三维工艺设计

基于MBD(Model Based Definition)技术的船舶数字化工艺设计是对船舶设计模式的创新。分析三维工艺设计流程,利用不锈钢化学品船隔舱分段统一的三维模型进行隔舱分段的工艺流程设计,将工艺模型和船舶产品模型进行中间产品装配体的划分,利用DELMIA对隔舱分段中间产品和资源设备进行人机交互式工艺仿真设计,使用优化后的工艺模型完成三维工艺文档的设计。结果表明:基于MBD的三维工艺设计能够打通模型在设计、仿真、建造等多个环节的数据链路,从而有效提升船舶的建造效率和质量。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。